Ventilating attics to minimize icings at eaves

Tobiasson, Wayne; Buska, James; Greatorex, Alan

doi:10.1016/0378-7788(94)90038-8

Cited by 11 publications

(8 citation statements)

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“…Figure 6 shows that the roof temperature for the sealed attic is everywhere above the melting point of ice, indicating a favorable condition for ice dam formation. A study by Tobiasson et al [35] observed that severe icing problems tended to occur when the outside temperature was below 22 °F (267.5 K) and the attic air temperature was above freezing. An effective approach to avoid problematic icings is to provide appropriate attic ventilation together with sufficient ceiling insulation to maintain an attic temperature below freezing when outside is cold.…”

Section: Sealed Atticmentioning

confidence: 99%

“…The inlet air temperature is set to 267 K, in order to investigate the possibility of ice dam formation. Based on field observations, Tobiasson et al [35] concluded that problematic icings developed very slowly, if at all, when the outside temperature was above 267.5 K. The choice of outside temperature of 267 K is corresponding to a condition that is most favorable for ice dam development.…”

Section: Effects Of Vent Sizementioning

confidence: 99%

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Numerical simulation of buoyancy-driven turbulent ventilation in attic space under winter conditions

Wang¹,

Shen²,

Gu³

2012

Energy and Buildings

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Section: Sealed Atticmentioning

confidence: 99%

Section: Effects Of Vent Sizementioning

confidence: 99%

Numerical simulation of buoyancy-driven turbulent ventilation in attic space under winter conditions

Wang¹,

Shen²,

Gu³

2012

Energy and Buildings

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“…9 It is also estimated that the global aircraft de-icing market will be worth $1.30 billion by 2020, 10 while the ice protection systems are expected to amount for $10.17 billion by 2021. 11 A degree of optical transparency is a crucial property in many of these applications, 1,2,6,8 achieved by -often-multifunctional windshields and windows, constituting indispensable architectural elements of commercial and residential buildings. 12,13 Several passive anti-icing strategies, based on scientifically nano-engineered surfaces, 14,15 have been developed since the late 1990s, including hierarchical superhydrophobic surfaces, [16][17][18][19][20][21][22] lubricant infused surfaces, 23 and liquid infused polymers.…”

mentioning

confidence: 99%

Metasurfaces Leveraging Solar Energy for Icephobicity

et al. 2018

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Inhibiting ice accumulation on surfaces is an energy-intensive task and is of significant importance in nature and technology where it has found applications in windshields, automobiles, aviation, renewable energy generation, and infrastructure. Existing methods rely on on-site electrical heat generation, chemicals, or mechanical removal, with drawbacks ranging from financial costs to disruptive technical interventions and environmental incompatibility. Here we focus on applications where surface transparency is desirable and propose metasurfaces with embedded plasmonically enhanced light absorption heating, using ultrathin hybrid metal-dielectric coatings, as a passive, viable approach for de-icing and anti-icing, in which the sole heat source is renewable solar energy. The balancing of transparency and absorption is achieved with rationally nanoengineered coatings consisting of gold nanoparticle inclusions in a dielectric (titanium dioxide), concentrating broadband absorbed solar energy into a small volume. This causes a > 10 °C temperature increase with respect to ambient at the air-solid interface, where ice is most likely to form, delaying freezing, reducing ice adhesion, when it occurs, to negligible levels (de-icing) and inhibiting frost formation (anti-icing). Our results illustrate an effective unexplored pathway toward environmentally compatible, solar-energy-driven icephobicity, enabled by respectively tailored plasmonic metasurfaces, with the ability to design the balance of transparency and light absorption.

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“…Icing is a common and unavoidable phenomenon in nature, and if not alleviated, ice accretion can have detrimental impacts on the normal performance and safety of ships, [ 1 ] offshore platforms, [ 2 ] power lines, [ 3 ] aircrafts, [ 4 ] wind turbines, [ 5 ] roads, [ 6 ] buildings, [ 7 ] and photovoltaics. [ 8 ] For example, ice accretion caused disasters have resulted in huge economic loss and large amounts of deaths, including the frozen rain in southern China (2008), the air disaster of Colgan Air Flight 3407 (2009) and the snow storm in northeast America (2014).…”

Section: Introductionmentioning

confidence: 99%

Electro‐/Photo‐Thermal Promoted Anti‐Icing Materials: A New Strategy Combined with Passive Anti‐Icing and Active De‐Icing

Xie

Jamil

et al. 2022

Adv Materials Inter

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Ice accretion on exposed surfaces is unavoidable as time elapses and temperature lowers sufficiently in nature, causing detrimental impacts on the normal performance of devices and facilities. To mitigate icing problems, both active de‐icing and passive anti‐icing materials (AIM) have been utilized. Traditional active anti‐icing methods suffer from energy consumption, low efficiency and high cost, while passive AIM meet the challenges of improving mechanical durability and maintaining low ice adhesion strength during icing/de‐icing cycles. Recently, new AIM are rationally designed by the combination of passive anti‐icing and active de‐icing, exhibiting efficient, reliable and energy‐saving properties. The conceptual idea is that passive AIM only need to reach a certain value of ice adhesion strength (i.e., τice<100 kPa) instead of achieving lowest ice adhesion strength, and simultaneously combine with active de‐icing techniques (i.e., electro‐thermal and photo‐thermal stimulus) to realize ideal all‐weather anti‐icing/de‐icing. In this review paper, the authors provide a brief introduction to passive AIM, and mainly focus on recent advances in the electro‐/photo‐thermal promoted AIM in terms of anti‐icing/de‐icing mechanisms, challenges and perspectives. The new conceptual anti‐icing/de‐icing strategy will inspire the rational design of the state‐of‐the‐art AIM in future and provides practical solutions to mitigate outdoor anti‐icing/de‐icing problems in daily lives.

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Ventilating attics to minimize icings at eaves

Cited by 11 publications

References 0 publications

Numerical simulation of buoyancy-driven turbulent ventilation in attic space under winter conditions

Numerical simulation of buoyancy-driven turbulent ventilation in attic space under winter conditions

Metasurfaces Leveraging Solar Energy for Icephobicity

Electro‐/Photo‐Thermal Promoted Anti‐Icing Materials: A New Strategy Combined with Passive Anti‐Icing and Active De‐Icing

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